XtAddExposureToRegion.3Xt(3Xt) — sys5 — Apollo Domain/OS SR10.3.5

XtAddExposureToRegion(3Xt)           SysV           XtAddExposureToRegion(3Xt)



NAME
     XtAddExposureToRegion - merge exposure events into a region

SYNTAX
     void XtAddExposureToRegion(event, region)
          XEvent *event;
          Region region;

ARGUMENTS
     event     Specifies a pointer to the Expose or GraphicsExpose event.

     region    Specifies the region object (as defined in <X11/Xutil.h>).

DESCRIPTION
     The XtAddExposureToRegion function computes the union of the rectangle
     defined by the exposure event and the specified region.  Then, it stores
     the results back in region.  If the event argument is not an Expose or
     GraphicsExpose event, XtAddExposureToRegion returns without an error and
     without modifying region.

     This function is used by the exposure compression mechanism (see Section
     7.9.3).

SEE ALSO
     X Toolkit Intrinsics - C Language Interface
     Xlib - C Language X Interface
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